1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 * Author: Catalin Marinas <catalin.marinas@arm.com>
5 */
6
7 #include <linux/gfp.h>
8 #include <linux/cache.h>
9 #include <linux/dma-map-ops.h>
10 #include <xen/xen.h>
11
12 #include <asm/cacheflush.h>
13 #include <asm/xen/xen-ops.h>
14
15 void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
16 enum dma_data_direction dir)
17 {
18 unsigned long start = (unsigned long)phys_to_virt(paddr);
19
20 dcache_clean_poc(start, start + size);
21 }
22
23 void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
24 enum dma_data_direction dir)
25 {
26 unsigned long start = (unsigned long)phys_to_virt(paddr);
27
28 if (dir == DMA_TO_DEVICE)
29 return;
30
31 dcache_inval_poc(start, start + size);
32 }
33
34 void arch_dma_prep_coherent(struct page *page, size_t size)
35 {
36 unsigned long start = (unsigned long)page_address(page);
37
38 dcache_clean_poc(start, start + size);
39 }
40
41 void arch_setup_dma_ops(struct device *dev, bool coherent)
42 {
43 int cls = cache_line_size_of_cpu();
44
45 WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
46 TAINT_CPU_OUT_OF_SPEC,
47 "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
48 dev_driver_string(dev), dev_name(dev),
49 ARCH_DMA_MINALIGN, cls);
50
51 dev->dma_coherent = coherent;
52
53 xen_setup_dma_ops(dev);
54 }
55
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